| From: | "Simon Riggs" <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Matthew T(dot) O'Connor" <matthew(at)tocr(dot)com> |
| Cc: | "Florian G(dot) Pflug" <fgp(at)phlo(dot)org>, "Postgresql-Hackers" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [RFC] GSoC Work on readonly queries done so far |
| Date: | 2007-06-06 20:51:43 |
| Message-ID: | 1181163103.26886.84.camel@silverbirch.site |
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| Thread: | |
| Lists: | pgsql-hackers |
On Wed, 2007-06-06 at 12:17 -0400, Matthew T. O'Connor wrote:
> Florian G. Pflug wrote:
> > Work done so far:
> > -----------------
> > .) Don't start autovacuum and bgwriter.
>
> Do table stats used by the planner get replicated on a PITR slave? I
> assume so, but if not, you would need autovac to do analyzes.
The replication is an exact block-level replication of the master. We
can't write very much at all on the slave.
So if a query runs slow because of lack of stats you'd need to run
ANALYZE on the master, which would then propagate the stats to the slave
which could then use them.
--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com
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